How does the coding of a copyprotection does not belong to the development of the game? I don't get this.... I know that it was using longtracks but what about some other clever bits to make the crackers life harder? I don't get why you don't want to ask about that...

In many (most) cases, it doesnt - the copy protection is added right at the end of the process by a completely different person/team.

Thats why most games are cracked in such a small amount of time. Just look at how many badly implemented RNC protected games there are out there, and then look at some of the better implemented ones with exactly the same protection mechanism.